EI-03-GT

i dont expect gas mileage to be good at all. comes with the territory.

67mustang302

Not always.

EI-03-GT

with a N/A car wouldnt it? i know a turbo car would be a different story

67mustang302

It depends on how it's built. Most setups get crap mileage because people build them with a wrong way of thinking and produce a large engine that inefficient in the rpm range it needs to operate.

Keep in mind the Corvette Z06 has the LS7, 427cid that makes 500hp and it gets 30+mpg highway. Granted, it's more sophisticated than a typical pushrod engine and uses Displacement on Demand. There's no reason a properly built 408 stroker with the right gearing couldn't get 17-20mpg highway.

EI-03-GT

Really?! how would i go about building something like that? not looking for an exact build unless you can think of something off the top of your head just more or less a general direction to go in to get the kind of performance im looking for and still get that kind of gas mileage. is it all in the tune or is it in the parts used?

67mustang302

Both. You need to build an engine that's efficient in the rpm range it's used. A lot of the setups that get bad mileage make great power at a drag strip when they're running above 4,000rpm. But a street engine spends 95% of it's life or more below 3,000rpm.

EI-03-GT

hmm gave me a lot to think about thanks for the help